In practice, browser makers have sometimes stepped outside the agreed standard set by the W3C, whether deliberately or accidentally, so it has been a headache for web designers to check the way page behave in different browser and make any necessary adjustments. The emphasis is now very much on adherence to standard, and if the designer is confident that a site’s code is compliant, browser can reasonably be expected to handle it correctly, Any tweaks introduce to overcome specific problems with particular browser should be kept to a minimum.